Mechanical thrombectomy anesthesia

Mechanical thrombectomy anesthesia

The anesthesia and critical care provider may become involved for airway management due to worsening neurologic status or to enable computerized tomography (CT) or magnetic resonance imaging (MRI) scanning, to facilitate mechanical thrombectomy, or to manage critical care of stroke patients. Existing data are unclear whether the mechanical thrombectomy procedure is best performed under general anesthesia or sedation.

Non-GA during MT for anterior acute ischaemic stroke with current-generation stent retriever/aspiration devices is associated with better 3-month functional outcome and lower mortality rates. These unadjusted estimates are subject to biases and should be interpreted with caution. 1).

The Anesthesia During Stroke (AnStroke) trial randomised patients to GA (propofol/remifentanil for induction with sevoflurane/remifentanil maintenance) or CS (remifentanil infusion) with strict haemodynamic control, normal ventilation and normoglycaemia. There were no differences in early neurological recovery, infarct volume, or anaesthetic or neurointerventional complications 2).

Retrospective cohort trials favor sedation over general anesthesia, but recent randomized controlled trials (RCT) neither suggest superiority nor inferiority of sedation over general anesthesia. Regardless of anesthesia type, a critical element of intraprocedural stroke care is tight blood pressure management 3).

In a Systematic Review and Meta-Analysis, the use of either GA or CS during EMT for patients with anterior circulation acute ELVO does not yield significantly different rates of functional independence at 3 months 4).

There were no significant differences in death, symptomatic intracranial hemorrhage, anesthesiologic complication, intensive care unit length of stay, pneumonia, and interventional complication. Conclusions Moderate-quality evidence suggests that general anesthesia results in significantly higher rates of functional independence than conscious sedation in patients with ischemic stroke undergoing endovascular therapy. Large randomized clinical trials are required to confirm the benefit.

In a randomized controlled trial general anesthesia does not result in worse tissue outcomes or worse clinical outcomes when compared with conscious sedation in acute stroke patients with large vessel occlusion undergoing mechanical thrombectomy 5).


Gravel G, Boulouis G, Benhassen W, Rodriguez-Regent C, Trystram D, Edjlali-Goujon M, Meder JF, Oppenheim C, Bracard S, Brinjikji W, Naggara ON. Anaesthetic management during intracranial mechanical thrombectomy: systematic review and meta-analysis of current data. J Neurol Neurosurg Psychiatry. 2019 Jan;90(1):68-74. doi: 10.1136/jnnp-2018-318549. Epub 2018 Sep 26. PMID: 30257967.

Löwhagen Hendén P, Rentzos A, Karlsson JE, Rosengren L, Leiram B, Sundeman H, Dunker D, Schnabel K, Wikholm G, Hellström M, Ricksten SE. General Anesthesia Versus Conscious Sedation for Endovascular Treatment of Acute Ischemic Stroke: The AnStroke Trial (Anesthesia During Stroke). Stroke. 2017 Jun;48(6):1601-1607. doi: 10.1161/STROKEAHA.117.016554. PMID: 28522637.

Businger J, Fort AC, Vlisides PE, Cobas M, Akca O. Management of Acute Ischemic Stroke-Specific Focus on Anesthetic Management for Mechanical Thrombectomy. Anesth Analg. 2020 Oct;131(4):1124-1134. doi: 10.1213/ANE.0000000000004959. PMID: 32925333.

Ilyas A, Chen CJ, Ding D, Foreman PM, Buell TJ, Ironside N, Taylor DG, Kalani MY, Park MS, Southerland AM, Worrall BB. Endovascular Mechanical Thrombectomy for Acute Ischemic Stroke Under General Anesthesia Versus Conscious Sedation: A Systematic Review and Meta-Analysis. World Neurosurg. 2018 Apr;112:e355-e367. doi: 10.1016/j.wneu.2018.01.049. Epub 2018 Jan 31. PMID: 29355808.

Howard LW, Demaerschalk BM, Chong BW, Bendok BR, Gritsch D, Marks LA, Wingerchuk DM, O’Carroll CB. Does General Anesthesia Compared With Conscious Sedation Result in Better Outcomes in Acute Stroke Patients Undergoing Endovascular Therapy? Neurologist. 2021 Mar 4;26(2):47-51. doi: 10.1097/NRL.0000000000000318. PMID: 33646989.

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